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If the surface temperature of the skin is taken to be, how much thermal power does the body described in the introduction radiate? Take the emissivity to be. Express the power radiated into the room
(a) What is the magnitude of the electric field at the third vertex of the triangle if both of the charges are positive? N/C. (b) What is it when one of the charges is positive and the other is nega
A cube of ice is taken from the freezer at -8.5 and placed in a 92 aluminum calorimeter filled with 314of water at room temperature of 20.0 . The final situation is observed to be all water at 15.0.
An electron experiences the greatest force as it travels 1.7 106 m/s in a magnetic field when it is moving southward. The force is upward and of magnitude 2.5 10-12 N. What are the magnitude and dir
The index of refraction for violet light in plastic is greater than that for red light by 0.0400. Delaying any rounding off of calculations until the very end, find the index of refraction for violet
If the power developed by the engine is 151 hp, estimate the total friction force acting on the car when it is moving at a speed of 35 m/s. One horsepower equals 746 W.
A toy cannon uses a spring to project a 5.39-g soft rubber ball. The spring is originally compressed by 4.93 cm and has a force constant of 7.96 N/m. When the cannon is fired, the ball moves 15.9 cm
A hot-air balloon is rising upward with a constant speed of 2.41 m/s. When the balloon is 8.13 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much
A motorcycle has a constant acceleration of 2.74 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its s
The track for a racing event was designed so that riders jump off the slope at 30 angle, from a height of 5 ft. The speed at the tip of the ramp is 60 mph. (A) How long will the rider remain in mid-
A block of mass 0.244 kg is placed on top of a light, vertical spring of force constant 4 925 N/m and pushed downward so that the spring is compressed by 0.108 m.
The electric field of an unspecified source charge is given by E=4.0x10^6 N/C, + i at a certain point in space. If an electron is placed at that point, what is the electric force that will act on t
Light from a laser beam with a wavelength of 530 nm passes through a narrow single slit and observed on a screen 1.0 m behind the slit. The first minimum of the diffraction pattern is 0.84 m from th
The potential difference between the "plates" is 82.3 mV. How much energy is stored in this capacitor?
(a) Determine the distance of the final image relative to the converging lens. (b) What is the height of the final image (including the proper algebraic sign)?
For the cases in which total internal refection is possible from either the top or bottom surface of a layer, determine the amount by which the angle of incidence exceeds the critical angle.
A cement block accidentally falls from rest from the ledge of a 74.3 -m-high building. When the block is 10.6 m above the ground, a man, 1.90 m tall, looks up and notices that the block is directly
A steam pipe is covered with 1.50 cm thick insulating material with a thermal conductivity of 0.200 cal/cm·°C·s.
Determine the horizontal distance between the launching ramp and the point of landing.
The temperature of the water is 20 degrees Celsius. What is the gauge pressure of the water where it enters the hose? (Answer has to be in Pa)
Calculate the electric field at x = 15.0 cm. N/C Locate a point on the positive x axis where the magnitude of the electric field is zero.
What minimum power must be supplied to the coils to maintain a temperature difference of 20.7°C between the bottom of the slab and its surface? Assume all the energy lost is through the slab. =